package com.yyq.common;



/**
 * @author yyq
 * @create 2021-08-03 15:32
 */
public class Yyq_String {

    public static void test(Object o){
        o="test";

    }
    public static void main(String[] args) {
       String a="123";
       StringBuffer b=new StringBuffer("123");
       StringBuilder  c=new StringBuilder("123");
       Yyq_String.test(a);
       Yyq_String.test(b);
       Yyq_String.test(c);
        System.out.println(a);
        System.out.println(b);
        System.out.println(c);
    }
}
